Chen Wei, Zhang Hongliang, Huang Han, Chen Lan, Wee Andrew Thye Shen
Department of Physics, National University of Singapore, 2 Science Drive 3, 117542, Singapore.
ACS Nano. 2008 Apr;2(4):693-8. doi: 10.1021/nn800033z.
Long range orientational ordering within C(60) monolayers is observed on p-sexithiophene (6P) monolayer nanostripes on Ag(111) at 77 K. Low-temperature scanning tunneling microscopy studies reveal that the C(60)-6P intermolecular interaction constrains all C(60) molecules to adsorb on their hexagons atop 6P molecules. The orientation-dependent bond-to-bond Coulomb interaction between charge deficient single bonds and double bonds with excess charge in neighboring C(60) molecules results in the in-plane orientational ordering and contributes to the lowering of the total energy of the orientationally ordered C(60) islands.
在77K下，在Ag(111)上的对苯撑硫酚（6P）单层纳米条带上观察到C(60)单层内的长程取向有序。低温扫描隧道显微镜研究表明，C(60)-6P分子间相互作用限制所有C(60)分子吸附在6P分子顶部的六边形上。相邻C(60)分子中电荷不足的单键与电荷过剩的双键之间的取向依赖键间库仑相互作用导致面内取向有序，并有助于降低取向有序的C(60)岛的总能量。
